linux-kernel - [PATCH v2 4/7] ARM: davinci: Add support for an L3RAM gen

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Message-Id: <1348861072-14507-5-git-send-email-mporter@ti.com>
Date:	Fri, 28 Sep 2012 15:37:49 -0400
From:	Matt Porter <mporter@...com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Hans J. Koch" <hjk@...sjkoch.de>,
	Benoit Cousson <b-cousson@...com>,
	Paul Walmsley <paul@...an.com>, Sekhar Nori <nsekhar@...com>
Cc:	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>
Subject: [PATCH v2 4/7] ARM: davinci: Add support for an L3RAM gen_pool

L3RAM (shared SRAM) is needed for use by several drivers.
This creates a genalloc pool and a hook for the platform code
to provide the struct gen_pool * in platform data.

Signed-off-by: Matt Porter <mporter@...com>
---
 arch/arm/mach-davinci/include/mach/common.h |    2 ++
 arch/arm/mach-davinci/include/mach/sram.h   |    3 +++
 arch/arm/mach-davinci/sram.c                |   28 ++++++++++++++++++++++++++-
 3 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-davinci/include/mach/common.h b/arch/arm/mach-davinci/include/mach/common.h
index bdc4aa8..5a2ea37 100644
--- a/arch/arm/mach-davinci/include/mach/common.h
+++ b/arch/arm/mach-davinci/include/mach/common.h
@@ -77,6 +77,8 @@ struct davinci_soc_info {
 	struct emac_platform_data	*emac_pdata;
 	dma_addr_t			sram_dma;
 	unsigned			sram_len;
+	dma_addr_t			l3ram_dma;
+	unsigned			l3ram_len;
 };
 
 extern struct davinci_soc_info davinci_soc_info;
diff --git a/arch/arm/mach-davinci/include/mach/sram.h b/arch/arm/mach-davinci/include/mach/sram.h
index 111f7cc..1a81e5b 100644
--- a/arch/arm/mach-davinci/include/mach/sram.h
+++ b/arch/arm/mach-davinci/include/mach/sram.h
@@ -24,4 +24,7 @@
 extern void *sram_alloc(size_t len, dma_addr_t *dma);
 extern void sram_free(void *addr, size_t len);
 
+/* Get the l3ram struct gen_pool * for use in platform data */
+extern struct gen_pool *sram_get_l3ram_pool(void);
+
 #endif /* __MACH_SRAM_H */
diff --git a/arch/arm/mach-davinci/sram.c b/arch/arm/mach-davinci/sram.c
index db0f778..e609fa3 100644
--- a/arch/arm/mach-davinci/sram.c
+++ b/arch/arm/mach-davinci/sram.c
@@ -15,7 +15,12 @@
 #include <mach/common.h>
 #include <mach/sram.h>
 
-static struct gen_pool *sram_pool;
+static struct gen_pool *sram_pool, *l3ram_pool;
+
+struct gen_pool *sram_get_l3ram_pool(void)
+{
+	return l3ram_pool;
+}
 
 void *sram_alloc(size_t len, dma_addr_t *dma)
 {
@@ -54,6 +59,9 @@ EXPORT_SYMBOL(sram_free);
 static int __init sram_init(void)
 {
 	unsigned len = davinci_soc_info.sram_len;
+	unsigned l3ram_dma = davinci_soc_info.l3ram_dma;
+	unsigned l3ram_len = davinci_soc_info.l3ram_len;
+	void *l3ram_virt;
 	int status = 0;
 
 	if (len) {
@@ -65,6 +73,24 @@ static int __init sram_init(void)
 	if (sram_pool)
 		status = gen_pool_add(sram_pool, SRAM_VIRT, len, -1);
 	WARN_ON(status < 0);
+
+	if (l3ram_dma) {
+		l3ram_pool =
+			gen_pool_create(ilog2(SRAM_GRANULARITY), -1);
+		if (!l3ram_pool)
+			status = -ENOMEM;
+	}
+
+	if (l3ram_pool) {
+		l3ram_virt = ioremap(l3ram_dma, l3ram_len);
+		if (l3ram_virt)
+			status = gen_pool_add_virt(l3ram_pool,
+						   (unsigned long)l3ram_virt,
+						   l3ram_dma, l3ram_len, -1);
+		else
+			status = -ENOMEM;
+	}
+
 	return status;
 }
 core_initcall(sram_init);
-- 
1.7.9.5

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